SYSTEM_DEVICE_INFORMATION

The SYSTEM_DEVICE_INFORMATION structure is what a
successful call to ZwQuerySystemInformation
or NtQuerySystemInformation produces in its output
buffer when given the information class SystemDeviceInformation
(0x07).

Documentation Status

The SYSTEM_DEVICE_INFORMATION structure is not documented.

A comment in NTDDK.H says of the documented CONFIGURATION_INFORMATION
structure that “it is used by the NtQuerySystemInformation system service to return
device type counts.” Be aware that “used by” would seem to mean only that a
CONFIGURATION_INFORMATION in the kernel provides the
data that gets returned, not that the data is returned as a
CONFIGURATION_INFORMATION.

Layout

The SYSTEM_DEVICE_INFORMATION is 0x18 bytes in both
32-bit and 64-bit Windows.

Offset

Definition

0x00

ULONG NumberOfDisks;

0x04

ULONG NumberOfFloppies;

0x08

ULONG NumberOfCdRoms;

0x0C

ULONG NumberOfTapes;

0x10

ULONG NumberOfSerialPorts;

0x14

ULONG NumberOfParallelPorts;

This page was created on 9th July 2016 but was not published
until 25th October 2016.